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Written by: Jim Beard
Tuesday March 31, 2015

Partially altered mineral, Mid-Atlantic Ridge

March 2015 Microphoto of the Month

As seawater penetrated fractures in this mineral (clinopyroxene) the parts of the mineral near the fractures began to react with the water to form a different mineral (amphibole). Note that many of the fractures are vertical in this view. These are natural planes of weakness in the clinopyroxene (cleavage planes). Plane polarized light. Field of view 3 mm.

Tags: Dr. Jim Beard, Earth Science, Geology, Microphoto of the Month, Research and Collections